66515425 has 12 divisors (see below), whose sum is σ = 86065920. Its totient is φ = 50898320.

The previous prime is 66515413. The next prime is 66515431. The reversal of 66515425 is 52451566.

It is not a de Polignac number, because 66515425 - 2⁷ = 66515297 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57265 + ... + 58414.

It is an arithmetic number, because the mean of its divisors is an integer number (7172160).

Almost surely, 2^66515425 is an apocalyptic number.

It is an amenable number.

66515425 is a deficient number, since it is larger than the sum of its proper divisors (19550495).

66515425 is a wasteful number, since it uses less digits than its factorization.

66515425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115712 (or 115707 counting only the distinct ones).

The product of its digits is 36000, while the sum is 34.

The square root of 66515425 is about 8155.6989277437. The cubic root of 66515425 is about 405.1732734157.

The spelling of 66515425 in words is "sixty-six million, five hundred fifteen thousand, four hundred twenty-five".